(adsbygoogle = window.adsbygoogle || []).push({}); Statistics: Question about "mild" and "extreme" outliers.

I am studying statistics, and have noticed the definitions of the mild and extreme outliers.

Mild outlier: Between 1.5q and 3q away from the nearest quartile, where q denotes the interquartile range.

Extreme outlier: More than 3q away from the nearest quartile, where q denotes the interquartile range.

So usually when I see mathematical definitions, I like to see a reason for them.

So I ask, are these numbers '1.5' and '3' chosen arbitrarily, or is there a real reason why these specific numbers were chosen?

I thank you for your time.

BiP

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Statistics: Question about mild and extreme outliers.

**Physics Forums | Science Articles, Homework Help, Discussion**